The principle of the selection is:
1. Triplet valves should be selected on the tube or device of high temperature and high -pressure medium. Such as thermal power plants, nuclear power plants, high temperature and high -voltage tube roads.
2. On the pipeline on the pipeline, the pipelines that are not strict with flow resistance. That is, there is not much consideration for pressure loss.
3. Small valves can choose needles, instrument valves, sample valves, pressure meter valves, etc.
4. There are traffic adjustment or pressure regulation, but the requirements for adjustment accuracy are not high, and the pipeline diameter is relatively small.
5. Small chemical fertilizer and large chemical fertilizer in the synthetic industrial production should be selected from the nominal pressure PN160 nominal pressure 16MPa or PN320 nickname pressure 32MPa high -pressure angle intercept valve or high -pressure angle -type throttling valve.
6. On the dewen workshop in the production of alumina Bayer, on the scorched pipeline, the valve body is easy to use, the valve seat is available, and the stubbornly sealing side of the DC intercept valve or the DC throttling valve.
7. In the water supply and heating projects in urban construction, the nominal pipelines are small through the tube, and the cut -off, balanced valve or plunger valve can be selected, such as the nominal pipelines with less than 150mm.